For people trying to lose weight, here’s the good news: Nutrition researchers have scoped out the enemy. Turns out potato chips and soda are the top waistline assassins.

Everyone knows to cut back on junk food, but in a recent large study examining what foods were most associated with weight gain, potato chips and sweetened drinks stood out as the ultimate arch villains. Indeed, not all snacks are created equal. Here’s why:

Scientists have started to suspect that when it comes to junk food, some snacks are worse than others. In a recent Harvard study, researchers tracked 100,000 Americans who were not overweight to begin with every 4 years to see who gained the most weight and what foods they ate. They found that an expanding waistline was most strongly linked to potato chips and sugar-sweetened drinks.

Read more: Two Worst Foods for Your Weight

Consider the potato: It’s heavy. It’s brown. It’s gnarly. It grows in the dirt. It’s hardly the most appealing food on earth.

Now consider the Pringle: It’s light. It’s golden. It’s crispy. And it comes in a can! A tremendous improvement on the earthbound spud, right? Except for one thing: Pringles aren’t potatoes.

Read more here: The Worst Chips and Dips

OTTAWA — The Canadian Food Inspection Agency is warning the public not to consume some potato chips because the products may be contaminated with salmonella.

It says the foods contain dry powder and paste hydrolyzed vegetable protein (HVP), ingredients which have been recalled in the U.S. and Canada by Basic Food Flavors Inc. due to salmonella contamination.

Read more: Some Lay’s Smokey Bacon chips recalled over salmonella fears